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| 1 /* | |
| 2 ** 2008 Jan 22 | |
| 3 ** | |
| 4 ** The author disclaims copyright to this source code. In place of | |
| 5 ** a legal notice, here is a blessing: | |
| 6 ** | |
| 7 ** May you do good and not evil. | |
| 8 ** May you find forgiveness for yourself and forgive others. | |
| 9 ** May you share freely, never taking more than you give. | |
| 10 ** | |
| 11 ************************************************************************* | |
| 12 ** | |
| 13 ** This file contains code to support the concept of "benign" | |
| 14 ** malloc failures (when the xMalloc() or xRealloc() method of the | |
| 15 ** sqlite3_mem_methods structure fails to allocate a block of memory | |
| 16 ** and returns 0). | |
| 17 ** | |
| 18 ** Most malloc failures are non-benign. After they occur, SQLite | |
| 19 ** abandons the current operation and returns an error code (usually | |
| 20 ** SQLITE_NOMEM) to the user. However, sometimes a fault is not necessarily | |
| 21 ** fatal. For example, if a malloc fails while resizing a hash table, this | |
| 22 ** is completely recoverable simply by not carrying out the resize. The | |
| 23 ** hash table will continue to function normally. So a malloc failure | |
| 24 ** during a hash table resize is a benign fault. | |
| 25 */ | |
| 26 | |
| 27 #include "sqliteInt.h" | |
| 28 | |
| 29 #ifndef SQLITE_OMIT_BUILTIN_TEST | |
| 30 | |
| 31 /* | |
| 32 ** Global variables. | |
| 33 */ | |
| 34 typedef struct BenignMallocHooks BenignMallocHooks; | |
| 35 static SQLITE_WSD struct BenignMallocHooks { | |
| 36 void (*xBenignBegin)(void); | |
| 37 void (*xBenignEnd)(void); | |
| 38 } sqlite3Hooks = { 0, 0 }; | |
| 39 | |
| 40 /* The "wsdHooks" macro will resolve to the appropriate BenignMallocHooks | |
| 41 ** structure. If writable static data is unsupported on the target, | |
| 42 ** we have to locate the state vector at run-time. In the more common | |
| 43 ** case where writable static data is supported, wsdHooks can refer directly | |
| 44 ** to the "sqlite3Hooks" state vector declared above. | |
| 45 */ | |
| 46 #ifdef SQLITE_OMIT_WSD | |
| 47 # define wsdHooksInit \ | |
| 48 BenignMallocHooks *x = &GLOBAL(BenignMallocHooks,sqlite3Hooks) | |
| 49 # define wsdHooks x[0] | |
| 50 #else | |
| 51 # define wsdHooksInit | |
| 52 # define wsdHooks sqlite3Hooks | |
| 53 #endif | |
| 54 | |
| 55 | |
| 56 /* | |
| 57 ** Register hooks to call when sqlite3BeginBenignMalloc() and | |
| 58 ** sqlite3EndBenignMalloc() are called, respectively. | |
| 59 */ | |
| 60 void sqlite3BenignMallocHooks( | |
| 61 void (*xBenignBegin)(void), | |
| 62 void (*xBenignEnd)(void) | |
| 63 ){ | |
| 64 wsdHooksInit; | |
| 65 wsdHooks.xBenignBegin = xBenignBegin; | |
| 66 wsdHooks.xBenignEnd = xBenignEnd; | |
| 67 } | |
| 68 | |
| 69 /* | |
| 70 ** This (sqlite3EndBenignMalloc()) is called by SQLite code to indicate that | |
| 71 ** subsequent malloc failures are benign. A call to sqlite3EndBenignMalloc() | |
| 72 ** indicates that subsequent malloc failures are non-benign. | |
| 73 */ | |
| 74 void sqlite3BeginBenignMalloc(void){ | |
| 75 wsdHooksInit; | |
| 76 if( wsdHooks.xBenignBegin ){ | |
| 77 wsdHooks.xBenignBegin(); | |
| 78 } | |
| 79 } | |
| 80 void sqlite3EndBenignMalloc(void){ | |
| 81 wsdHooksInit; | |
| 82 if( wsdHooks.xBenignEnd ){ | |
| 83 wsdHooks.xBenignEnd(); | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 #endif /* #ifndef SQLITE_OMIT_BUILTIN_TEST */ | |
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Chromium Code Reviews
Issue 2363173002:
[sqlite] Remove obsolete reference version 3.8.7.4. (Closed)
